From the Introduction and Keeper's Information section:
On a trip on the fast and luxurious RMS Adriatic from New York to Dublin the Investigators have the chance to rub shoulders with the great and the good of transatlantic society. The joyful occasion of a wedding on board is interrupted by some strange behaviour. Can the investigators uncover the threat in time, or will they be shadowed by a well-protected foe?
This short adventure can be slotted into many of the other Age of Cthulhu adventures, and features deck plans and details of ship-board activities.